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5.1 Recommend the ratio that will be used to obtain a smooth plaster finish for interior walls, using one bag of cement - NSC Civil Technology Construction - Question 5 - 2023 - Paper 1
Question 5
5.1 Recommend the ratio that will be used to obtain a smooth plaster finish for interior walls, using one bag of cement. 5.2 In chronological order, explain the fir... show full transcript
Worked Solution & Example Answer:5.1 Recommend the ratio that will be used to obtain a smooth plaster finish for interior walls, using one bag of cement - NSC Civil Technology Construction - Question 5 - 2023 - Paper 1
Step 1
5.1 Recommend the ratio that will be used to obtain a smooth plaster finish for interior walls, using one bag of cement.
Answer
To achieve a smooth plaster finish for interior walls using one bag of cement, I recommend the ratio of 1:3, which means one part cement to three parts sand. Alternatively, using 1 bag of cement to 2.5 wheelbarrows of sand is also a suitable option.
Step 2
5.2 In chronological order, explain the first THREE steps to prepare a concrete floor to receive the screed.
Answer
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Chip the Surface: Start by chipping the surface of the concrete floor to remove any loose material and ensure good adhesion for the screed.
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Remove All Debris and Dust: After chipping, thoroughly clean the area by sweeping away any dust, debris, or other materials that could interfere with the screed application.
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Test the Absorption Ability of the Concrete: Finally, check the absorption ability of the concrete by sprinkling water on the surface to ensure it absorbs sufficiently, which is crucial for proper screed bonding.
Step 3
5.3 Explain the term monolithic screed.
Answer
A monolithic screed is defined as a layer of screed that is applied in a single pour over a fresh concrete surface. This method ensures a uniform thickness and integrates fully with the substrate, promoting better adhesion and structural integrity.
Step 4
5.4 Explain how you will plaster the stop end of a wall in chronological order.
Answer
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Clamp Straight Edges to Stop-End of the Wall: Begin by clamping straight edges or battens along the stop end, ensuring they are vertical and aligned correctly.
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Apply the Plaster and Allow to Dry: Mix the plaster and apply it to the stop end using a trowel, ensuring an even layer, then allow it to set slightly.
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Cut the Access Plaster to the Level of the Straight-Edges: After setting, cut away excess plaster from the edges so that the surface is perfectly level with the straight edges, finishing off the sharp edges to give a clean finish.
Step 5
5.5 State TWO advantages of a gauged arch.
Answer
- Looks Neat and Aesthetic: A gauged arch provides a visually pleasing appearance, often enhancing the overall design of the structure.
- Do Not Need Plastering: Unlike traditional arches, gauged arches have a finished surface that does not require additional plastering, saving time and materials.
Step 6
5.6 Draw in the ANSWER BOOK a neat sketch showing half of a wooden turning piece for a semi-circular arch with open lappings.
Answer
In the ANSWER BOOK, sketch a half-circle representing the wooden turning piece. Include labeled features such as the 'formwork board', 'laggings', and ensure that open lapping regions are clearly indicated for structural clarity.
Step 7
5.7 ANSWER SHEET 5.7 shows the outlines of two consecutive brick courses of a one-and-a-half-brick pier built in English bond. Use ANSWER SHEET 5.7 and complete the pictorial views of the consecutive brick courses.
Answer
On ANSWER SHEET 5.7, accurately depict the two courses of bricks. Ensure that the bonds align according to English bond standards, presenting clear detailing for both the first and the second courses to display the continuity and stability of the structure.